Spectral flux density F(ν) vs. UV ribbon area AUV for 212 GHz (top panel) and 405 GHz (bottom panel) for flares with a positive spectral slope (9 events, black crosses and dates). For flares recorded at 230 and 345 GHz the fluxes were recalculated as F230 GHz/(2302)×(2122) and F345 GHz/(3452)×(4052), respectively (3 events, blue crosses and dates). For two flares registered at 93 and 140 GHz the fluxes were recalculated in a similar way to ν = 212 GHz and are shown only in the upper panel (2 events, purple crosses and dates). The flux density (solid lines) predicted by black-body emission for temperatures T = 2 × 104, 2 × 105, 2 × 106 K are shown by pink, dark yellow, and dark blue lines, respectively.
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